Note: Descriptions are shown in the official language in which they were submitted.
~765Z
1 This inventi.on relates in general to a magneti.c
recording and reproducing ap~aratus such as a video
tape recorder (hereinafter referred to as recorder of
a helical scanning type in which a magnetic tape con-
tained in a tape cassette is drawn out and wound helically
around a head cylinder for a predetermined angul.ar
distance, the head cylinder containing a plurality of
rotating heads. In more particula,r, the invention
concerns with a structure of such recorder apparatus
in which the magnetic tape is adapted to be automatically
led out from the tape cassette instead in the apparatus
and automatically loaded on various mechanisms con-
stituting the recording and reproducing portions o
the recorder.
In a recorder apparatus of the helical
scanning type, it is required that the magnetic tape
- as drawn out from the tape cassette is precisely wound
around the head cylinder in a st~te inclined for a
predetermined angle. To this end, the locations as
well as inclinations of guide posts positioned at the
inlet and exit sites of the magnetic tape relative to
the head cylinder have to be carefully and accurately
determined previously.
Recently, there have been developed VTR
apparatus in which the magnetic tape is automatically
led out from the tape cassette and wound around the
head cylinder with the aid of tape leading-out pins.
When these pins are intended to be used as the tape
guide pocts after the tape has been 1.oaded, they mus-t
~0 be f'ixedly held precisely at respecti,ve predeterm:irled
-- 1 --
3~
65~Z
" ~ , . . .
1 positions.
An object of the invention is to provide a
magnetic tape recording and reproducing apparatus in
which the tape leading-out pins serving for both leading
out the magnetic tape from the inserted tape cassette
and guiding subsequently the thus loaded magnetic tape
can be positively and fixedly held precisely at pre-
determined guide positions against movements in any
directions.
With the above object in view there is provided
according to one aspect of the present invention a
magnetic recording and reproducing apparatus of rotating
head type comprising a base plate a head cylinder of
a cylindrical shape mounting on the base plate and
containing rotating heads movable bases mounted on
the base plate at both sides of the head cylinder so
as to be movable resoectively between first positions
adjacent to the head cylinder and second positions adjac^nt
to a loaded rnagnetic tape cassette tape leading-out
pins each mounted on each of the movable bases driving
means for moving the movable bases between the first
and the second positions first stopper means adapted
to engage with the movable bases or alternatively f:irst
members mounted respectively on the movable bases
thereby to limit the rnovements of the movable bases
- at the first position second stopper means adapted
to engage with the movable bases or alternatively second
members mounted on tne rnovable ~-ases thereby to prevent
movements of the movable bases in directions subst n-tially
~0 per?endicu1.ar to the plane of the base plate at tht? fi.rst
~il7~5~2
1 positions, and third stopper means adapted to engage
with the movable bases or alternatively third members
mounted on the movable bases at the first position
thereby to prevent movements of the movable bases in
lateral directions substantially perpendicular to the
moving directions of the movable base.
The above and other obJects, features and
advantages of the invention will become more apparent
from detailed description of preferred embodiments of
the invention taken in conjunction with the accompanying
drawings, in which
~ ig. 1 is a perspective view showing schematically
an example of a magnetic tape cassette employed in a
magnetic recording and reproducing apparatus or VTR
apparatus according to the present invention,
~ig. 2 is a top plan view showing an embodi-
ment of a magnetic recording and reproducing a~paratus
according to the invention in a state before the magnetic
tape is loaded,
Fig. 3 is a similar view to Fig. 2 and sho~,~s
the same in a state after the tape cassette has been
loaded,
Fig. 4 is a bottom plan view of a tape leading-
out mechani,sm of a magnetic recording and reproducing
apparatus shown in ~igs. 1 to 3,
~ ig. 5 is a side view of the tape leading-
out mechanism shown in Fig. 4 with a -porti,on shown in
section,
Fig. 6 is a front view of the same with a
portion shown in secti,on,
11~7S5~
1 Fig. 7 is a top plan view of the same,
Fig. 8 shows the same in a side view with
some portions shown in section,
Fig. 9A is a perspective view of a sto~?per
means employed in an embodiment of a magnetic recording
and reproducing apparatus according to the present
invention,
Fig. 9B is a top plan view of the same with
some portion being broken away,
Fig. 9C is a side view of the same with some
portions shown in section,
Fig. 9D is a bottom plan view of the same
with some parts being omitted,
Fig. 10 shows the stopper means in a state
mounted on a base plate of a magnetic recording and
reproducing apparatus in a front view with some portions
broken away,
Fig. 11 is a partially sectional side view
of the tae leading-out mechanism and the stopper means
to illustrate relations existing therebetween,
Fig. 12A is a top plan view showing schematically
the tape leading-out rrlechanism and the stopper means
in the state in which both are engaged with each other,
Fig. 12~ is a partially sectional side view
of the same,
- Fig. 12C is a schematic bottom plan view of
the same,
Fig. 1~ is a plan view showing .a main portion
of a magnetic recording and reproducing apparatus in
~0 accordance with an errlbodiment of the rJreserlt invention,
5~Z
1 ~ig. 14 is a partially sectioned side view
of the same, and
Fig. 15 is a fragmental side view showing
a portion of the str~lcture shown in Fig. 13.
Referring to ~igs. 1 and 2 which show a tape
cassette to be employed in a magnetic recording and
reproducing apparatus such as magnetic tape recorder
a tape cassette bod~ 1 accommodating therein a tape
supply reel 2 and a winding reel 3 on which is loaded a
magnetic tape 4 suspended in tension through guide posts
6, 5a and 5b. The tape 4 is partially exposed exteriorly
through a window opening portion formed in the cassette
body at one side thereof'.
There are formed in the window or opening
portion notches 7 and 8 for accommodating therein tape
leading-out pins or the li~e and concaved notch 9
for receiving therein a capstan. The notches 7, 8 and
9 will also be described hereinbelow. The magnetic
tape 4 extends transversely through these notches 7, 8
and 9 in tension. '~hen the tape cassette is not used,
the window or opening ?ortion is covered by a cover
member 12 which is pivotally mounted on the cassette
body 1 so as to expose partially the magnetic tape 4
when the cassette is loaded in the recorder in a man~er
such as shown in Fig. 1.
Referring to Fig. 2 which shows a magnetic
tape recorder according to the present invention in a
top plan view with a top cover being removed, the afore-
mentioned cassette body 1 is loaded on a base plate 10
in a predetermined position with the supply real 2 being
~L1765Z
1 fitted on a supply reel supporting member 11 and the
winding-on reel ~ being fitted on an associated support-
ing member 12. Reference numeral 62 denotes an arasing
head; 63, a head for a control signal and an audio
signal; 64, an electric motor for a capstan 65; and
66, a pinch roller. Numerals I and II denote generally
a pair of magnetic tape leading-out mechanisms or
assemblles for leading out a magnetic tape 4 from a
cassette 1 and for winding it around a rotatable head
cylinder 13 which is mounted on the supporting base
plate 10 in an inclined position.
Construction of the tape leading-out mechanism
I will be described in detail with the references to
Figs. 4, 5, 6, 7 and 8. Reference numeral 14 denotes
a base portion of the tape leading-out assembly, which
base has two smooth faces 15a and 15b _n parallel with
each other. On the smooth surface 15a provided is a
hub 16 having a diameter 15 and a pin 47. Mounted on
the smooth surface 15a of the base portion 14 at one
end thereof is a projecting piece 18 having a flat face
17 substantial]y flush with the plane of the flat surface
15a. The flat face 17 may be lower than the flat surface
15a at a distance as indicated by t in Fig. 5. In the
illustrated embodiment 9 the tolerance t is in the range
of 0.02 to 0.05 mm and may vary in a dependance on the
precision as required in a practical apparatus. The
width 1~l of the projecting piece 18 is selected narrower
than the width T of a sliding guide grroove 19 provided
in the base plate 10. In the case of the embodiment
~0 illustrated in Fig. 2, the sliding g~uide groove is of
652
1 arcuate shape having a predetermined rad:ius. It is,
however, noted that the configuration of the guide
groove is never restricted to such arcuate shape but
may be of a segment in a parabo].ic shape or any other
shape so that the groove 19 extends from the notches
portion 7 of the loaded tape cassette 1 and passes by
a side portion of the head cylinder 13. The width T
of.the groove is selected substantially equal to the
diameter D of the hub 16 so that the latter is slidably
engaged in the former, as shown in ~ig. 6. In this
manner, the base portion 14 of the leading-out assembly
can be slidably guided on the base plate 10 along the
guide groove 19. ~vrther, because the width W of the
projecting piece 18 is smaller than the width T of the
guide groove 19 while the latter is substantially equa.l
to the diameter D of the hub, the base pcrtion 14 can
be pivoted to some degree about the hub 16 in the direc-
tion indicated by arrow A-A', as is shown in ~ig. 7.
An upstanding pin 20 is anchored in the base portion
14 of the tape leading-out mechanis}n perpendicular to
the flat and smooth face 15a and projects for a short
distance from the face 15a and for a longer distance
from the flat surface 15b. The vertically upstandi.ng
pin 20 serves to engage with the magnetic tape 4 in
the cassette 1, and after the tape has been led out,
- the pin 20 functions as a guide pin for defining the
running path of the tape 4. Reference numeral 21 denotes
the base portion of a correcting post 22 inclined at a
predetermined angle ~ relative to the flat surface 15bo
~0 The base portion is fixedly secured onto the flat or
-- 7 --
1:11765'~
1 smooth face 15b of the base porti,on 14 by means of a
screw 59 so that the axis of the post 22 will be intersect
that of the upstanding pin 20. The screw 59 is adapted
to be received in a mounting aperture slot 60 which is
- 5 elongated in the transversal direction of the guide
groove 19, as can be seen from Fig. 4. Wi.th such
arrangement, when the screw 59 is loosened, it is
possible to make the base portion 21. of the correcting
post 22 pivot around the upstanding leading-out pin for
a limited angular distance in the direction indicated
by arrows B-~', thereby to allow a, fine adjustment for
positioning the correcting post 22.
A leaf spring 23 having forked end portion is
mounted on a seat 24 provided on the flat surface 15a
of the tape leading-out base portion 14 in such a manner
as shown in Figs. 3, 5 and 7, and serves the smooth
face 15a of the base portion 14 to abut to the top
surface of the base plate 10 under resilient pressure
and to prevent the base portion 14 from being disenga.ged
from the guide groove 19.
In the foregolng, description has been made
to the construction of the tape leading-out mechanism I.
It should be noted that the tape leading-out mechanism
II has the same structure as the mechanism I except
that the geometrical arrangement of the components and
. ' parts constituting the tape leading-out mechanism II is
syrr~netrical to that of the above described mechanisrn I
in respect to a center line extending therebetween,
as can be seen in Fig. 2, a.nd tha-t a correcting post
22' is inclined outwardly from a verticall.y upstand:ing
111765Z
1 pin 20'. In other points the structure of the tape
leading-out mechanism or assembly II is substantially
same as that of the mechanism I and therefore detailed
description thereof will be eliminted. To make a better
understanding the mechanism II, like reference numerals
each with a prime designate corresponding components
or parts to that in the mechanism I.
The position of the tape leading-out mechanisms
I and II after the magnetic tape 4 has been pulled out
the cassette 1 are limited by associated stoppers 25
and 25'. Since these stopper 25 and 25' are also of
same structure except for the symmetrical arrangement
thereof, detailed description will be made only to the
stopper 25 by referring to Figs. 2, 9A to 9D, and 10.
As can be seen from these drawings, the stopper
25 is composed of a pair of laterally projecting plates
27 and 61 disposed in parallel and in opposition to
each other. The upper projecting plate 27 is formed
with a V-like notch 26, while the lower projecting plate
61 is formed with a U-like notch 61. The disposition
of these plates 27 and 26 is made in such way that the
axial line c-c' crossing through the center lines a-a'
and b-b' of the V- or U-like notches 26 and 28 extends
in perpendicular to the upper surface of the base pla-te
10, refer to ~igs. 9B, 9D and 10. The width S of the
U-like notch 28 is substantially equal to the diameter
of the vertically upstanding leading-out pin 20 described
herein before so that the pin 20 may be received in the
U-like notch 28, as indicated by broken line in Fig.
9D. The stopper 25 is mounted on the base plate 10
_ 9 _
52
1 pivotablly around a stud 29 at a mountlng arm 25a and
is adapted to be fixedly secured at predetermined posi-
tion by a screw 30 through an elongated slot -~1 formed
in the arm plate 25a. The stopper 25 as mounted on
the base plate 10 may be pivoted about the stud 29
is some degree in the direction Y-Y' (Fig. 2). The
stopper 25 has an inclined guide surface 32 ~hich serves
to guide the projecting piece 18 formed in the base
portion 14 of the tape leading-out mechanism I into a
position ~here the projecting piece 18 is engaged in
a recess 33 formed in the stopper 25, as the tape
leading-out mechanism I is-slidingly displaced in the
direction denoted by X during the tape leading-out
operation thereof, as is shown in Fig. 11. Since the
structure of the stopper 25' is symmetrical to the
stopper 25, further description of the stoPper 25'
~ill be eliminated. The components of the stopper 25'
corresponding to those of stopper 25 are denoted by
like reference numerals each attached to a prime.
In this connection, it is to be noted that the slide
guide grooves 19 and 19' of the tape leading-out
assemblies I and II have, respectively, a predetermined
curvature having center points 34 and 34', and that the
stud 29 or 29' for attaching the mounting arm 25a or
25a' of the stopper 25 or 25' is positioned on a line
z-z or Z~-3~ passing through the above mentioned center
point ~4 or 34' and the center position ~5 or 35' of
the tape leading-out pin 20 or 20' stationary engaged
in the V-like notch 26 or 26' of the stopper 25 or
25'. In practice, it is required to adjust the positions
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1~765Z
.
1 of the stoppers 25 and 25' to some degree in either
direction when the running path of the magnetic tape
4 and particularly, the envelope thereof are to be
adjusted. To the end, the centers of the V-like notches
26 and 26' may ideally be adjusted in their positions
along curvatures of the grooves 19 and 19' during the
adjustment of the stopper 25 and 25'. However, such
procedure will not be suited for the massproduction of
the apparatus. Alternatively, it is proposed that the
stoppers 25 and 25' are adjustable pivotably around the
mounting studs 29 and 29' sO as to give the substantially
same effect as if they were displaced along the curvature
of the guide grooves 19 and 19' within an extremely
limited rotation range, since, in practice, the adjustable
range of the sto~per 25 or 25' about the stud 29 or 29'
is in the order of 1 mm.
Referring to Figs. 13 and 14 in combinatiGn
with ~ig. 2, reference numerals 37 and 36 indicate
rotatable tape loading rings or disks coa~ially
disposed together with in a superposed relation below
the base plate 10 by means of associated rollers 38a,
38b~ 38c, 38d, 38e and 38f. Each of the loading rings
37 and 36 is formed with gear teeth 39 and 40 in the
peripheral portions thereof in predetermined angular
ranges of angle ~ and ~, respectively. The loading
ring 36 is provided with a slide member 41 which is
slidably rr.oved in the longitudinal direction as ~ided
by guides pins 42 and 42' anchored on the ring 3~ and
- received in engag:ing slots 44 and 44', respectively,
which slots 44 and 44' are forrned in the slide member
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1 41. The member 41 is usually biased in the direction
indicated by arrow M by means of a tension spring 43
connected to one end thereof. The slide mernber 41 is ~.
provided with a bent portion 45 at the other end w~ich
is formed with an elongated slot 46 of a sufficiently
large width to allow a slidable engagement with the
pin 47 provided in the hub portion 16 of the tape
leading-out assembly I. The elongated slot 46 is required
for compensating difference between the rotating path of
the loading ring 36 and the sliding path of the tape
leading-out mechanism I. In this connection, it will
be appreciated that the slot 46 and the guide pin 47 :
may be provided in the reversed relation, i.e. the
former may be formed in the loading ring 36, while the ~
15 latter may be mounted on the slide member 41. : .;
In a similar manner, the loading ring 37 is
provided with a slide member 48 adapted to be guided
by means of pins 49 and 49' received in associated slots
and urged in the direction N by means of a tension spring
20 50. As in the case of the slide member 41, the member :
48 is provided with a bent portion 51 which is formed
with an elongated slot 52 having a sufficient large
width to allow a slidable engagement with the pin 47'
: provided in the hub portion 16' of the tape leading-
25 out mechanism II. :
Reference numeral 53 denotes a spur gear
meshed with the toothed peripheral portion 39 o~ the ~ :~
loading ring or disk 37. Another spur gear 54 is
engaged with the both the spur gear 53 and the toothed
peripheral portion 40 of the loading ring or disk and
:
765Z
1 adapted to be rotated by a loading motor (not shown)
by way of a worm 55 and a worm gear 56 shown in Fig. 15.
In more detail the arrangement is made such that the
loading rings or disks 36 and 37 are rotated in opposite
directions upon the rotation of the loading motor in
either direction. Referring to Fig. 13, a limit switch
57 is provide for terminating the loading operation.
In more detail, the switch 57 is adapted to engage with
a cam portion 58 formed in the loading ring 36 at the
end of the rotation of the loading rings 36 and 37
over respective predetermined angular ranges, thereby
to interrupt power supply to the loading motor to stop
the rotations of the loading rings 36 and 37.
Now description will be made on the tape
15 loading operation of the above described apparatus.
When a tape cassette such as shown in Fig. 1 is inserted
in a magnetic tape recorder having the above mentioned
structure, the cassete is lowered into the body of the
recorder by means of an elevation mechanism, which
itself is known to those skilled in the art, to such
a position that the vertically upstanding tape leading-
out pins 20 and 20' as well as correcting posts 22 and
22' may be received in the notched recesses 7 and 8
formed in the tape cassette body 1. The capstan 65
25 is received in the notched recess 9. Refer to Fig. 2.
In this manner, the tape leading out mechanisms I and
II come to the positions to engage with the loading
rings 36 and 37, as in shown in Fig. 2. The rotation
angle GC of the loading rings 36 and 37, which angle
is attained when the cam portion 58 has come to the
- 13 -
~765~:
1 position to actuate the limit switch, is selected
greater than an angle ~ PQR, where P is the geometrical
center point of the upstanding pin 20 or 20' located
in the notched recesses 7 and 8 formed in the tape
cassette, as is shown by solid line in Fig. 2, Q is
the comrnon center of the rotation of the loading rings
36 and 37, and R is the geometrical center position of
the upstanding pin 20 or 20' stationarily engaged in
the V-like recesses 26 or 26' of the stopper 25 or 25'
which represented by broken lines 35 and 35' in Fig. 2.
In the reproduction mode, when an associated
push button (not shown) is pressed down, the loading
motor is energi~ed to start the rotation of the loading
rings 3~ and 37 in the clockwise and counter-clockwise
directions, respectively, as the result of which the
tape leading-out mechanism I is slidably moved along
the guide groove 19 in the direction ~, while the tape
leading-out mechanism II is guided by the groove 19'
in the direction Y. In the meantime, the magnetic tape
4 is drawn out from the cassette 1 as engaged to the
upstanding leading-out pins 20 and 20' as well as the
correcting posts 22 and 22' and is contacted to the
peripheral surface of the rotating head cylinder 13.
When the tape leading-out pins have attained to the
position where they are engaged in the V-like notches
26 and 26' as well as the U-like notches 28 and 28' of
the associated stoopers 25 and 25', as shown in Fig. 3,
the accompanied rotational movements of -the slid:ing
rnembers 41 and 48 mounted on the loading rings 36 and
37, respectively, are stopped, and thereafter only the
~7~
1 loading rings 36 and 37 are permitted to rotate untll
the cam 58 actuates the limit switch 57 serving for
terminating the leading operation. During this phase
of operation, the tension springs 43 and 50 are
resiliently expanded as the loading rings 36 and ~7
are rotated, whereby restoring forces of thus distorted
springs 43 and 50 will press the upstanding pins 20
and 20' against the V-like grooves 26 and 26' of the
stoppers through the slide members 41 and 48. In this
manner, the upstanding pins 20 and 20' are securely
held against the V-like grooves 26 and 26' of the
stoppers 25 and 25' under the resilient forces of the
tension springs 43 and 50. In this state, the loading
motor is deenergized and the loading rings 36 and 37
will stop at the attained positions without being
returned to the original position, because of the
provision of the worm 55 and worm gear 56 meshed with
each other. Subsequently, a plunger 68 is actuated
to press an idler roll 66 to the capstan 65 thereby
to cause the magnetic tape 4 to run for the reproducing
operation.
It should be mentioned here that, the rotating
head cylinder 13 is inclined relative to a vertical
line perpendicular to the plane of the base plate 10
at an angle equal to the angle of the correcting posts
22 and 22' inclined relative to the same vertical lir~e
in order that the magnetic ta~e 4 supplied f'rom the
source reel 2 and wound around the winding reel 4 is
perfectly contacted closely with the peripheral surf`~ce
of the rotating head cylinder. As will be seen frorn
- 15 -
111~6S~
1 Fig. 3, when the loading of the magnetic tape 4 has
been completed, the magnetic tape 4 fed from the supply
reel 2 to the winding reel 3 by way of the ~ e ~osts
6 and 5a, a tape tensioning pin 70, an aux~ eading-
5 out pin 71, a stationary pin 77, the erasing head 62,the upstanding leading-out pin 20, the correcting post
22, the rotating head cylinder 13, the correcting post
22', the other upstanding leading-out pin 20', the head
63 for control and audio signals, the capstan 65 and
the guide post 5b. The tape is eventually wound on
the winding reel 3.
When the magnetic tape 4 is led out from the
cassette 1, the upstanding pins 20 and 20' as well as
the correcting pins 22 and 22' will serve as the guide
pins for leadlng out the tape 4 from the cassette 1
and then serve as the positioning pins for snugly
contacting the magnetic tape 4 with the peripheral
surface of the rotating head cylinder 13, when the
pins are pressed against the stoppers 25 and 25'. Since
these pins 20; 20' and posts 22; 22' of the tape leading-
out mechanisms I and II are driven by the annular loading
rings 36 and 37 to lead out the magnetic tape 4, it
will be appreciated that the curvature of the moving
path, corresponding to the guide groove 19 or 19'; for
the magnetic tape leading-out mechanisms I or II is
not re~uired to coincide with the curvature of the
loading ring 36 or 37. Thus, according to the teaching
of the present invention, a ring of a small diameter
can be employed for the loading rings 36 and 37.
Additional.ly, when it is compared with the hitherto
- 16 -
: .
1 known arrangement in which the tape leading-out
assemblies I and II are rotated by means of rotating
arms, the use of the loading rings as in the case of
the illustrated embodiment o~ the present invention
allows other mechanisms required in the recorder to
be installed in space available at the center portion
of the loading rings, which advantageously leads to
a miniaturization of the overall size or dimension
of the recorder. Furthermore, the arrangement is that
the pair of loading rings 36 and 37 are driven by a
single loading motor through a pair of ~leshed spur
gears 53 and 54, and thus, it permits the paired
loading rings 36 and 37 to be rotated at an equal
speed in the opposite directions with a simplified
driving st-ructure.
Deferring to Fig. 2, the auxiliary tape
leading-out pin 71 is anchored to a rotatable arm 74
which is adapted to berotated about a stud 73 b~ a
suitable driving means (not shown). Upon inserting
the tape cassette 1, the pin 71 is positioned at the
notched recess 7 of the cassette 1 and adapted to be
rotated for a predetermined angular distance during
the tape loading operation (~ig. 2) thereby to provide
- an aid for closingly contacting the magnetic tape 4 to
the erasing head 62.
The tension pin 70 is mounted on a tension
arm 76 rotated about a stud 75. ~efore the magne-tic
tape has been erfectly loaded, the arm 76 is enforcively
rotated to a position in which the tension pin 70 is
~0 not yet in contact with the magnetic tape 4, as is
- 17 -
6SZ
1 shown in Fig. 2. After the completed tape loading
opera~ion, the arm 76 is released from the above
restrained state. Then, the tension pin ;0 ~ill bear
on the led-out tape 4 to serve thereafter as the
tension pin.
Next, referring to ~igs. 12A, 12~ and 12C,
description will be made on the manner in which the
magnetic tape leading-out mechanism I is accurately
brought into engagement with the stopper 25. As will
be appreciated from the foregoing description, the
tape leading-out mechanisrn I, as moved through the
rotation of the loading ring 36, has the hub portion
16 snugly fitted in the guide groove 19. Accordingly,
the tape leading-out mechanism I will approach to the
stopper 25 as guided by the groove 19 and the upstanding
pin 20 will at first engage in the V-like notch 26 of
the projection 27. At that time, the pin 20 will never
undergo any lateral movements and be positively positioned
at the center of the V-like notch. In such condition,
any further force will tend to move upwardly the leading
projection 18 of the tape leading-out mechanism I,
since the upstanding pin 20 has been stationarily
positioned in the V-like groove 26. The projection
18 will thus bear against the upper surface of the
concaved recess 33 formed in the stopper 25 to be
held at this position. The lower portion of the up-
standing pin 20 is then prevented frorn being moved
laterally as it is snugly fitted in the U-like groove
28 formed in the lower projection 61. In this manner
the upstanding tape leading-out pin 20 is restricted
- 18 -
1~17!f~SZ
1 at the end position against any movement in all directions
~y means of the cooperating V-like groove 26, U-like
groove 2~ and upper surface of the concaved portion
33, whereby the pin 20 is positioned correctly and
precisely in perpendicular to the plane of the base
plate 10. Thus, in the either operation of the recorder
in reproducing or recording mode, the magnetic -tape 4
is accurately placed in contact with the peripheral
surface of the rotating head cylinder 13 by means of
the upstanding tape leading-out pin 20. The same will
of course apply to the function of the other pin 20'.
When a button (not shown) for stopping the
operation of the recorder, the tape unloading condition
is set up, whereby the pins 20 and 20' are restored to
the original positions.
- 19 -
